New York’s ambitious bike-share program launches this Memorial Day weekend. It’s a joyrider’s dream . . . but one thing’s missing: There are 6,000 bicycles for rent but no bike helmets at the rental kiosks.

Looks like a public-health crisis in the making, and one perfect for Mayor Bloomberg. But Mike’s not interested in forcing bikers to wear helmets. To the contrary, he opposes legislation requiring riders to use that all-important safety gear.

What happened to our nanny-in-chief?

Bloomberg will shoot the gun out of your hand, slap the soda from your mouth, wash the salt from your food and steal formula from a baby.

He’ll do anything he darn well pleases in his pro-health crusade — except make bikers wear helmets.

It’s an interesting exception. According to one of those city studies he’s so fond of, 97 percent of the New York bike accidents that prove fatal involve bikers who are without helmets. But Bloomberg worries that a safety upgrade would “discourage biking.”

And there’s the rub.

Inside the mayor’s soul, there’s a nanny-state war going on, pitting green living against red asphalt. Helmets save lives, but if the city starts ticketing riders for helmet infractions, bikers won’t ride nearly as often.